(i)

This binary should run on any Amiga with dos.library >=V36. However,
unless you have at least AmigaDOS V37, you should never try option -x.
Option -X is no problem though.

(ii)

dircmp2.000 is for 68k,68k10,68k12 CPU's
dircmp2.020 is for 68k20,68k30 and *maybe* higher CPU's